Provides added power for resistance against hard-hitting stereo, competitive racing, or off-road wear and tear vibration. Along with a more efficient design, it also has the same case/cover configuration used by original equipment manufacturers for an easier fit into more applications. No elaborate marketing gimmicks or hold-down retrofits, just decades of experience to provide a better fit, more power and longer life. stereo, competitive racing, or off-road wear and tear vibration. Along with a more efficient design, it also has the same case/cover configuration used by original equipment manufacturers for an easier fit into more applications. No elaborate marketing gimmicks or hold-down retrofits, just decades of experience to provide a better fit, more power and longer life.